Jaw-dropping activities from one nearing retirement! (5)
I believe the answer is:
yawns
'jaw-dropping activities' is the definition.
'yawns' can be an answer for 'activities' (yawn is a kind of activity). I'm not sure about the 'jaw-dropping' bit.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for yawns that I've seen before include "Gapes" , "Signs of fatigue or boredom" , "seems tired" , "Expresses no interest" .)